Question

Ajuuuuuuuuuuuuuuuuuuutor. va rog! pls pls pls pls pls pls pls ex 4​

Answer 1

Răspuns:

Explicație pas cu pas:

a/3 = b/5 = c/7

a = 3b/5

c = 7b/5

a)

a + c = 2b

3b/5 + 7b/5 = 2b

10b/5 = 2b

2b = 2b adevarat

_____________

b)

a^2 - b^2 + c^2 = 297

9b^2/25 - b^2 + 49b^2/25 = 297

9b^2/25 - 25b^2/25 + 49b^2/25 = 297

33b^2/25 = 297

b^2 = 25*297/33 = 225

b = √225 = 15

a = 3b/5 = 3*15/5 = 9

c = 7b/5 = 7*15/5 = 21